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#pragma once
#include "ItemHandler.h"
class cItemSlabHandler final:
public cItemHandler
{
using Super = cItemHandler;
public:
using Super::Super;
private:
virtual bool CommitPlacement(cPlayer & a_Player, const cItem & a_HeldItem, const Vector3i a_PlacePosition, const eBlockFace a_ClickedBlockFace, const Vector3i a_CursorPosition) const override
{
// Confer BlockSlab.h, which we're in cahoots with to make the below logic work.
// If clicking a slab, combine it into a double-slab:
if (cBlockSlabHandler::IsAnySlabType(a_Player.GetWorld()->GetBlock(a_PlacePosition)))
{
if (!a_Player.PlaceBlock(a_PlacePosition, GetDoubleSlabType(static_cast<BLOCKTYPE>(a_HeldItem.m_ItemType)), static_cast<NIBBLETYPE>(a_HeldItem.m_ItemDamage)))
{
return false;
}
a_Player.SendBlocksAround(a_PlacePosition.x, a_PlacePosition.y, a_PlacePosition.z, 2); // (see below)
return true;
}
// Set the correct metadata based on player equipped item:
if (!a_Player.PlaceBlock(a_PlacePosition, static_cast<BLOCKTYPE>(a_HeldItem.m_ItemType), FaceToMetaData(static_cast<NIBBLETYPE>(a_HeldItem.m_ItemDamage), a_ClickedBlockFace, a_CursorPosition)))
{
return false;
}
/* This is a workaround for versions < 1.13, where the client combines a slab in the
direction of the clicked block face of a block ignoring build collision, rather than replacing said block.
Resend blocks to the client to fix the bug.
Ref.: https://forum.cuberite.org/thread-434-post-17388.html#pid17388 */
a_Player.SendBlocksAround(a_PlacePosition.x, a_PlacePosition.y, a_PlacePosition.z, 2);
return true;
}
static NIBBLETYPE FaceToMetaData(const NIBBLETYPE a_BaseMeta, const eBlockFace a_ClickedBlockFace, const Vector3i a_CursorPosition)
{
switch (a_ClickedBlockFace)
{
case BLOCK_FACE_TOP:
{
// Bottom half slab block:
return a_BaseMeta & 0x07;
}
case BLOCK_FACE_BOTTOM:
{
// Top half slab block:
return a_BaseMeta | 0x08;
}
case BLOCK_FACE_EAST:
case BLOCK_FACE_NORTH:
case BLOCK_FACE_SOUTH:
case BLOCK_FACE_WEST:
{
if (a_CursorPosition.y > 7)
{
// Cursor at top half of block, place top slab:
return a_BaseMeta | 0x08;
}
else
{
// Cursor at bottom half of block, place bottom slab:
return a_BaseMeta & 0x07;
}
}
default: UNREACHABLE("Unhandled block face");
}
}
/** Converts the single-slab blocktype to its equivalent double-slab blocktype. */
static BLOCKTYPE GetDoubleSlabType(BLOCKTYPE a_SingleSlabBlockType)
{
switch (a_SingleSlabBlockType)
{
case E_BLOCK_STONE_SLAB: return E_BLOCK_DOUBLE_STONE_SLAB;
case E_BLOCK_WOODEN_SLAB: return E_BLOCK_DOUBLE_WOODEN_SLAB;
case E_BLOCK_RED_SANDSTONE_SLAB: return E_BLOCK_DOUBLE_RED_SANDSTONE_SLAB;
case E_BLOCK_PURPUR_SLAB: return E_BLOCK_PURPUR_DOUBLE_SLAB;
}
UNREACHABLE("Unhandled slab type");
}
};
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